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Polarization beam splitter and optical device

Active Publication Date: 2015-12-31
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a polarization splitter and an optical device with high productivity.

Problems solved by technology

However, it is difficult for the silica waveguide to increase a relative index difference between a core and a clad.
Accordingly, the minimum bend radius of the waveguide is of the order of mm, and thus it is difficult to miniaturize a chip.

Method used

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  • Polarization beam splitter and optical device
  • Polarization beam splitter and optical device
  • Polarization beam splitter and optical device

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Embodiment Construction

[0019]Exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The following exemplary embodiments are examples of the present invention, and the present invention is not limited to the following exemplary embodiments. The same reference numerals in the specification and the drawings denote the same components.

[0020]FIG. 1 is a schematic view showing a coherent mixer element 1 used for digital coherent communication. The coherent mixer element 1 is, for example, a planar lightwave circuit (PLC), and includes a polarization beam splitter PBS and a 90-degree optical hybrid 90° OH. The polarization beam splitter PBS is a circuit having a polarization beam splitting function. The polarization beam splitter PBS is, for example, a Mach-Zehnder interferometer that uses the birefringence of arm waveguides. The 90-degree optical hybrid 90° OH is a circuit (coherent mixer circuit) having a function for retrieving phase information.

[0021]The...

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Abstract

Provided are a polarization beam splitter and an optical device with high productivity. A polarization beam splitter (PBS) according to an exemplary embodiment of the present invention includes: a demultiplexer (11) that is formed of a rib waveguide (50) and demultiplexes input light into first input light and second input light; a multiplexer (14) that is formed of the rib waveguide (50) and multiplexes the first input light and the second input light that are obtained by demultiplexing the input light by the demultiplexer (11); a first arm waveguide (12) that is formed of a channel waveguide (51) and guides the first input light to the multiplexer (11); and a second arm waveguide (13) that is formed of the channel waveguide (51), generates a phase difference in the first input light propagating through the first arm waveguide, and guides the second input light to the multiplexer (14).

Description

TECHNICAL FIELD[0001]The present invention relates to a polarization beam splitter and an optical device.BACKGROUND ART[0002]In recent years, in regard to ultrahigh-speed communications exceeding 100 Gb / second, studies have been vigorously conducted on digital coherent communication by Dual Polarization Differential Quadrature Phase Shift Keying (DP-QPSK) excelling in wavelength use efficiency, receiving characteristics, and dispersion compensation capability. A receiver for DP-QPSK system requires a function to split an optical signal into polarized waves, and a 90-degree optical hybrid function for retrieving phase information from the split optical signals. The standardization of receivers having such functions has been studied by OIF (Optical Internetworking Forum), an industry group promoting high-speed data communications, and the development of receivers that comply with the specifications for the standardization has been vigorously pursued.[0003]Incidentally, it is said that...

Claims

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Application Information

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IPC IPC(8): G02B6/126G02B6/122G02B6/293G01J9/02
CPCG02B6/122G02B6/1228G02B6/126G02B6/29352G02B2006/121G01J9/02G02B6/2938G01J2009/0288G02B2006/12097
Inventor MATSUMOTO, TAKASHI
Owner NEC CORP
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